CN109439840A - A kind of method of billet caster production potassium steel - Google Patents

A kind of method of billet caster production potassium steel Download PDF

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Publication number
CN109439840A
CN109439840A CN201811627366.6A CN201811627366A CN109439840A CN 109439840 A CN109439840 A CN 109439840A CN 201811627366 A CN201811627366 A CN 201811627366A CN 109439840 A CN109439840 A CN 109439840A
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steel
furnace
control
slag
billet
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CN201811627366.6A
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Chinese (zh)
Inventor
刘珂
陈涛
孙齐松
张慧峰
吕迺冰
丁宁
孔祥涛
佟倩
徐士新
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Shougang Group Co Ltd
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Shougang Group Co Ltd
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Priority to CN201811627366.6A priority Critical patent/CN109439840A/en
Publication of CN109439840A publication Critical patent/CN109439840A/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/52—Manufacturing or repairing thereof
    • B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Continuous Casting (AREA)

Abstract

A kind of method of billet caster production potassium steel, belongs to steel-making continuous casting technical field.It is completed by the steel scrap+pig iron → electric furnace → LF furnace refining → billet caster, step is to enter furnace in the ratio of the pig iron 30~50% and steel scrap 50~70%；Aim carbon control tap in 0.1wt% or more；Strong deoxidation is carried out to the top of the slag using calcium carbide, Al powder and silicon carbide when LF furnace refines, continuous small-billet casting, middle packet baking, argon filling, carbon-free covering, control liquid steel temperature, 95~120m3/h of crystallizer cooling water flow, electromagnetic agitation, control conticaster pulling rate are 1.9 ± 0.2m/min, and temperature range control in slab corner is at 1000~1100 DEG C before guaranteeing into withdrawal straightening machine.The advantage is that solving the problems, such as that steel grade aligning is difficult by reducing the methods of crystallizer and secondary cooling intensity, rationally effectively, laying a good foundation for production.

Description

A kind of method of billet caster production potassium steel
Technical field
The invention belongs to steel-making continuous casting technical field, in particular to a kind of method of billet caster production potassium steel.
Background technique
The sum total gold content of potassium steel described in this patent reaches 15~16%, and wherein Mn content is about 13.0~15.5%, tool Standby good cold and hot working plasticity, can be rolled into core material, can cold-drawn core pulling.The steel grade has good mechanical property, such as enough High intensity and plasticity, to overcome deformation and the frictional resistance during core pulling.
Plug of the steel grade due to being used as drilling tool steel, casting billet surface need to guarantee flawless, scab, be mingled with folding and non-gold Belong to the surface defects such as field trash.Meanwhile center portion quality is well without obvious shrinkage cavity, loose.
It is lower in view of use die casting process steel ingot lumber recovery, and slab quality fluctuation is larger, seriously affects core pulling rate.Exploitation Suitable continuous casting process for billets is the only way for improving product quality.It is needed for the steel grades continuous casting process for billets Potassium steel mould flux technology, slab temperature is overcome to control and the difficult points such as straightening technology, internal quality control technology.
Through patent and literature search, it is related to the patent of high violent steel at present mainly based on plate kind, if Han Guoxian is for ﹒ high Manganese steel: 107937834 A of CN, a kind of ultra-low temperature surroundings high manganese steel sheet of river steel Gu Fen ﹒ and its production method: CN A kind of low yield strength ratio high tenacity high manganese steel sheet of 107523748 A, Wuyang steel and its production method: 107620010 A of CN, reality Test a kind of preparation method of high-strength high-ductility high manganese steel plate of room Yan Jiu ﹒: 107779575 A of CN.Be related to high violent steel continuous casting process slab, There is not been reported for the patent of square billet.
Potassium steel continuous casting needs to solve the difficult points such as the matching of furnace machine, quality control on the surface, straightening process design, formulates a fitting The production technology of reason is the key link for realizing potassium steel billet production.Based on the understanding to steel grade thermal physical property parameter, system point Slab process of setting Warm status under different process is analysed, crystallizer and secondary cooling intensity are reduced, guarantees slab high-temperature straightening, at Function solves the problems, such as that the steel grade elevated temperature strength is high-leveled and difficult to align.Select mould flux to adapt to the lower liquidus curve of the steel grade Temperature suitably takes crystallizer weak cold technique, solves the control problem of surface defect of bloom, rationally effectively, for the potassium steel Production lay a good foundation.
Summary of the invention
The purpose of the present invention is to provide a kind of method of billet caster production potassium steel, solve inside slab, The control and potassium steel elevated temperature strength of surface defect are high, are difficult to the problem of aligning.By controlling casting parameters, effectively keep away Exempt from production process and bleed-out occurs, to produce qualified potassium steel continuous casting billet.
A kind of method of billet caster production potassium steel, passes through the steel scrap+pig iron → electric furnace → LF furnace refining → 150mm × 150mm~200mm × 200mm billet caster is completed, and specific step and parameter is as follows:
1, electric furnace is added in steel scrap+pig iron to smelt, enters furnace ingredient are as follows: pig iron ratio 30~50%, steel scrap 50~ 70%, it is uniformly added into；Aim carbon control tap in 0.1wt% or more.Using high-quality steel scrap, increase pig iron ratio, improves and smelt Carbon content in molten steel.
2, LF furnace refines:
Strong deoxidation operation is carried out to the top of the slag using calcium carbide, Al powder and silicon carbide, to form white slag as early as possible；LF restores finishing slag alkali Degree control guarantees its good mobility 2.8~3.3.The ingredient of P, S and Si in strict control alloy, deoxidization terminal C: 0.70~0.95wt%；Si :≤0.70wt%；Mn:13.5~19.5wt%；P :≤0.030wt%；S :≤0.015wt%； Ni:0.04~0.3wt%；Cr:0.05~0.2wt%；Cu:0.05~0.25wt%.
3, continuous small-billet casting:
1) packet baking temperature >=1100 DEG C in open and pour packet argon filling in preceding, 1.5~2.0MPa of argon pressure, and the argon filling time 5~ 10min；
2) big packet long nozzle and crystallizer submersed nozzle are all made of the aluminium carbonaceous mouth of a river, and long nozzle is sealed using Ar；
3) packet uses carbon-free tundish covering flux in, keeps top of the slag black flour；
4) mould flux is used, 1030~1100 DEG C of slag melting point, 1.5~2.5PaS of viscosity are protected；
5) molten steel temperature in tundish control is at 1443~1453 DEG C, 30~40 DEG C of the degree of superheat；
6) crystallizer cooling water flow: 95~120m3/h；Two is cold using automatic distribution water, 0.5~0.6L/kg of specific water；Knot Brilliant device stirring parameter are as follows: 3~5Hz of frequency, 250~350A of electric current；
7) end stirring parameter are as follows: 13~18Hz of frequency, 100~250A of electric current；
8) conticaster casting speed control is in 1.9 ± 0.2m/min, and slab corner temperature range controls before guaranteeing into withdrawal straightening machine At 1000~1100 DEG C；
9) 60~90bar of straightening force；
10) slow cooling after slab is offline.
The potassium steel chemical component mass percent of above method production are as follows: C:0.7~1.0；Si :≤0.80；
Mn:13.0~20.0；P :≤0.045；S :≤0.03；Ni:0.04~0.3；Cr:0.05~0.25；Cu:0.05~ 0.25, surplus is Fe and inevitable impurity.
It is an advantage of the current invention that network analysis slab is under different process based on the understanding to steel grade thermal physical property parameter Process of setting Warm status reduces crystallizer and secondary cooling zone intensity of cooling, guarantees that casting blank surface temperature is in aligning area Within the scope of 1000~1100 DEG C, the difficult problem of steel grade aligning is overcome, is that the continuous small-billet casting of potassium steel is raw rationally effectively Production is laid a good foundation.
Specific embodiment
Embodiment 1
A kind of method of billet caster production potassium steel, the present embodiment realize height by taking the long material producing line of Shoudu Iron and Steel Co as an example The small billet industrial production of manganese steel, specific step and parameter are as follows:
1, the steel grade is smelted by 60tCONSTEEL EAF, enters furnace ingredient are as follows: the steel scrap+pig iron, pig iron ratio 45%, steel scrap 55% is uniformly added into.Tapping aim carbon 0.12%.
2, LF furnace refines:
1) strong deoxidation operation is carried out to the top of the slag using calcium carbide, Al powder and silicon carbide.
2) LF restores the control of finishing slag basicity 3.0.
3) in strict control alloy P, S and Si ingredient, deoxidization terminal C:0.78%；Si:0.60%；Mn:14.5%；P: 0.030%；S:0.015%；Ni:0.08%；Cr:0.13%；Cu:0.12%
3, continuous small-billet casting: billet caster is that 4 machines 4 flow full arc type 150mm × 150mm billet caster, base curve Radius R9.0m；
1) packet baking temperature is greater than 1150 DEG C in.Open packet argon filling in front of pouring, argon pressure 1.7MPa, argon filling time 8min.
2) big packet long nozzle and crystallizer submersed nozzle are all made of the aluminium carbonaceous mouth of a river.Long nozzle is sealed using Ar.
3) packet uses carbon-free tundish covering flux in, keeps top of the slag black flour.
4) mould flux is used, 1050 DEG C of slag melting point, viscosity 2.0PaS are protected.
5) molten steel temperature in tundish control is at 1450 DEG C, 39 DEG C of the degree of superheat.
6) crystallizer cooling water flow: 115m3/h.Two is cold using automatic distribution water, specific water 0.55L/kg；Crystallizer electromagnetism Mixing parametric: frequency 4.5Hz, electric current 320A.
7) end stirring parameter: frequency 15Hz, electric current 150A.
8) conticaster casting speed control is in 1.9m/min, and temperature range control in slab corner is 1050 before guaranteeing into withdrawal straightening machine ℃。
9) straightening force 65bar.
10) slow cooling after slab is offline.
Using the method for the invention, the continuous small-billet casting production of potassium steel is realized, is as shown in table 1 smelting ingredient. Table 2 show the grading of slab low multiple quality, meets control and requires.
1 potassium steel of table smelts ingredient
Sample sequence C Si Mn P S Ni Cr Cu
Middle packet 0.79 0.61 14.5 0.032 0.015 0.08 0.13 0.12
The grading of 2 potassium steel slab low power of table

Claims (2)

1. a kind of method of billet caster production potassium steel, including the steel scrap+pig iron → electric furnace → LF furnace refining → 150mm × 150mm~200mm × 200mm billet caster, which is characterized in that specific step and parameter is as follows:
1) electric furnace is added in steel scrap+pig iron to smelt, enters furnace ingredient are as follows: pig iron ratio 30~50%, steel scrap 50~70%, Even addition；Aim carbon control tap in 0.1wt% or more；
2) LF furnace refines: carrying out strong deoxidation operation to the top of the slag using calcium carbide, Al powder and silicon carbide, shortens white slag and form the time；LF The control of finishing slag basicity is restored 2.8~3.3, guarantees its mobility；The ingredient of P, S and Si, deoxidization terminal in strict control alloy C:0.70~0.95wt%；Si :≤0.70wt%；Mn:13.5~19.5wt%；P :≤0.030wt%；S :≤0.015wt%； Ni:0.04~0.3wt%；Cr:0.05~0.2wt%；Cu:0.05~0.25wt%；
3) continuous small-billet casting:
1. middle packet baking temperature >=1100 DEG C open and pour packet argon filling in preceding, 1.5~2.0MPa of argon pressure, and the argon filling time 5~ 10min；
2. big packet long nozzle and crystallizer submersed nozzle are all made of the aluminium carbonaceous mouth of a river, long nozzle is sealed using Ar；
3. packet uses carbon-free tundish covering flux in, keeps top of the slag black flour；
4. using mould flux, 1030~1100 DEG C of slag melting point, 1.5~2.5PaS of viscosity are protected；
5. molten steel temperature in tundish is controlled at 1443~1453 DEG C, 30~40 DEG C of the degree of superheat；
6. crystallizer cooling water flow: 95~120m3/h；Two is cold using automatic distribution water, 0.5~0.6L/kg of specific water；Crystallizer Stirring parameter are as follows: 3~5Hz of frequency, 250~350A of electric current；
7. end stirring parameter are as follows: 13~18Hz of frequency, 100~250A of electric current；
8. conticaster casting speed control, in 1.9 ± 0.2m/min, temperature range control in slab corner exists before guaranteeing into withdrawal straightening machine 1000~1100 DEG C；
9. 60~90bar of straightening force；
Slow cooling after 10. slab is offline.
2. the method according to claim 1, wherein the potassium steel chemical component quality percentage of the method production Than are as follows: C:0.7~1.0；Si :≤0.80；Mn:13.0~20.0；P :≤0.045；S :≤0.03；Ni:0.04~0.3；Cr: 0.05~0.25；Cu:0.05~0.25, surplus are Fe and inevitable impurity.
CN201811627366.6A 2018-12-28 2018-12-28 A kind of method of billet caster production potassium steel Pending CN109439840A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110125356A (en) * 2019-04-26 2019-08-16 首钢集团有限公司 A kind of continuous small-billet casting production method of drilling tool cored steel
CN110479972A (en) * 2019-09-05 2019-11-22 首钢集团有限公司 A kind of continuous casting process of H13 mould steel small billet

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Publication number Priority date Publication date Assignee Title
CN1068857A (en) * 1991-10-10 1993-02-10 株洲市机械工业研究所 The multicomponent alloy malleablized high-Mn steel
CN102423795A (en) * 2011-11-25 2012-04-25 山西太钢不锈钢股份有限公司 Continuous casting method for high manganese steel
CN106086598A (en) * 2016-08-23 2016-11-09 四川丰元机械制造有限公司 A kind of high cleanliness austenite is without the smelting process of magnetic Retaining Ring Steel
CN106825463A (en) * 2017-02-09 2017-06-13 首钢总公司 A kind of method that billet caster produces low-carbon (LC) Ni Mo steel alloys

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CN1068857A (en) * 1991-10-10 1993-02-10 株洲市机械工业研究所 The multicomponent alloy malleablized high-Mn steel
CN102423795A (en) * 2011-11-25 2012-04-25 山西太钢不锈钢股份有限公司 Continuous casting method for high manganese steel
CN106086598A (en) * 2016-08-23 2016-11-09 四川丰元机械制造有限公司 A kind of high cleanliness austenite is without the smelting process of magnetic Retaining Ring Steel
CN106825463A (en) * 2017-02-09 2017-06-13 首钢总公司 A kind of method that billet caster produces low-carbon (LC) Ni Mo steel alloys

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110125356A (en) * 2019-04-26 2019-08-16 首钢集团有限公司 A kind of continuous small-billet casting production method of drilling tool cored steel
CN110479972A (en) * 2019-09-05 2019-11-22 首钢集团有限公司 A kind of continuous casting process of H13 mould steel small billet

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Application publication date: 20190308